Crusher jaws



R. F. BRUNS April 30, 1968 2 Sheets-Sheet 1 Filed Oct. 15, 1965 April 30, 1968 R. F. BRUNS 3,380,674

CRUSHER JAWS Filed Oct. 15, 1965 2 Sheets-Sheet 2 n I! P u (.3 I l: p |o| Fig. 6

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United States Patent 0 3,380,674 CRUSHER JAWS Robert F. Bruns, Sioux Falls, S. Dak. (16411 Barnstable Circle, Huntington Beach, Calif. 92647) Filed Oct. 15, 1965, Ser. No. 496,326 10 Claims. (Cl. 241-291) ABSTRACT OF THE DISCLOSURE A jaw member to be utilized in a rock crushing apparatus and the like which comprises a plate-like body member having a generally convex working face and a generally planar rear surface and wherein the convex face is provided with a centrally disposed concave region extending across a major portion of the width of the jaw member. The concave region terminates intermediate the ends of the face of the jaw member whereby the face portions of the jaw member adjacent the ends thereof are generally smooth. The concave region of the jaw member is provided with a plurality of longitudinally extending transversely spaced teeth and wherein the longitudinally disposed transversely extending sloping walls of the centrally disposed concave region of the jaw member are angled so as to significantly reduce belching of rock being crushed from between a pair of cooperating jaw members constructed in accordance with the invention.

The present invention relates to rock crushing apparatus and more particularly to a reversible and replaceable jaw member for a crusher such as utilized to crush rock ore, stone, gravel and minerals that require primary reduction in size for additional processing. Even more particularly the crusher jaw member of the present invention is particularly suitable as a replacement for an original die or crushing plate for a crusher of the type which employs a movable jaw member to urge the material to be crushed against a stationary jaw member.

Crushers of the class described normally rely upon a gravity flow of a material being crushed downwardly between a pair of jaw members one of which is pivotally mounted for reciprocating movement in and out of crushing engagement with the stationary jaw member.

It will be appreciated that numerous means may be utilized to effect reciprocation of the movable jaw member. However, such crusher apparatus is generally always provided with renewable jaw members due to the fact that wearing of the jaw members is a major problem, inasmuch as the efiiciency and crushing of the apparatus is adversely affected by such wear. While numerous replaceable crusher jaw members have been proposed heretofore in an attempt to prolong the life of the jaw members while still retaining the desired degree of crushing as wear progresses, none have been entirely satisfactory. In addition, such jaw members proposed heretofore generally have not succeeded in providing a jaw member of the class described which substantially eliminates the belching of material to be or being crushed between the jaw members by virtue of the nipping action of the opposed jaws as the pivotally secured jaw member is reciprocated into crushing engagement with the stationary jaw member.

It is therefore a primary object of this invention to provide a reversible, replaceable jaw member which is constructed in such a manner so as to substantially overcome the inherent shortcomings of renewable crusher jaw members proposed heretofore.

Another object of the present invention is to provide a reversible, renewable jaw member which may be reversed end for end regardless of the percentage of wear on the opposing crushing jaw member.

A further object of the present invention is to provide cooperating crusher jaw members which are constructed so as to substantially eliminate the belching of material being crushed by providing a concave region on the working face of the jaw members whereby an angular relationship of the concavity to the nipping angle of the jaw members is provided which establishes a tendency for the jaw members to grade the material to be crushed and pull them into the jaw members rather than tending to belch the material out from between the crusher jaws.

Still another object of the present invention is to provide a crusher jaw member comprising a plate-like body having a generally convex working face provided with a plurality of vertically extending spaced apart teeth in the central portion of the working face wherein the valleys between the teeth are contoured so as to provide a generally concave region which is adapted to substantially eliminate the belching of material from the crusher.

Still another object of the present invention is to provide a crusher jaw member of the class described wherein the jaw member is provided with a plurality of vertically extending spaced-apart teeth which teeth are centrally disposed with regard to the working face of the jaw member and cover approximately one-half of the central portion of the jaw member along substantially the width thereof.

It is a further object of the present invention to provide a crusher jaw member of the class described wherein the tooth design is such that the valleys between the teeth are approximately one-half the depth of the distance between the crowns of the teeth.

Still a further object of the present invention is to provide a crusher jaw member of the class described provided with centrally disposed corrugations or teeth which corrugated area is flanked by areas devoid of such corrugations so as to greatly increase the life of the jaw member while increasing the crushing tonnage over that normally handled by somewhat structurally analogous crusher jaw members.

Still a further object of the present invention is to provide crusher jaw members of the class described characterized by laterally extending beveled portions adjacent the upper and lower ends of the working face so as to provide unrestricted discharge of the crushed material downwardly and outwardly from between a pair of opposed crusher jaw members.

Still a further object of the present invention is to provide complementary crusher jaw members of the class described which coact to crush rock and the like more efiiciently than was possible with somewhat analogous crusher jaw members known heretofore.

Still a further object of the present invention is to provide a crusher jaw member of the class described wherein the beveled portion adjacent the upper and lower ends of the jaw member are disposed at an angle of approximately 25 -40 relative to a plane defined by the base of the jaw member.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

FIGURE 1 is a vertical sectional view showing crusher jaw members constructed in accordance with the present invention operatively positioned within a conventional rock crusher, a fragmentary portion of which is shown;

FIGURE 2 is a vertical sectional view of the jaw members of FIGURE 1 wherein one jaw member has been reciprocated about a pivot point to effect crushing of the material to be acted upon;

FIGURE 3 is a rear plan view of the crusher jaw member of the present invention;

FIGURE 4 is a longitudinal sectional view taken substantially along the plane of theline 4-4 of FIGURE 3.;

FIGURE 5 is a front elevational view of crusher jaw member of FIGURE 3; and

FIGURE 6 is a transverse sectional view taken substantially on the plane of the line 6--6 of FIGURE 3.

Referring now to the drawings and FIGURES 1 and 2 in particular it will be seen that there is illustrated a crusher jaw indicated generally at 10 which comprises a part of a suitable rock crusher apparatus, only a portion of which is illustrated, inasmuch as the structure of the rock crusher incorporating the novel jaw member of the present invention is conventional and does not constitute a part of the present invention. Accordingly, only that portion of a rock crusher apparatus necessary to an understanding of the operative placement of the jaw members of the present invention is illustrated. The crusher jaw members 12 and 14 constructed in accordance with the present invention are removably secured by conventional means not shown, to their respective backing plates 16 and 18 which backing plates are a conventional part of the rock crusher apparatus. The backing plate 18 is rigidly and non-movably secured in the apparatus and the backing plate 16 is pivotally secured for pivotal movement about the shaft 20 to permit movement of the backing plate 16 and its integral jaw member 12 into crushing engagement with the jaw member 14.

A conventional means for effecting reciprocation of the backing member 16 is indicated schematically at 22 wherein an eccentric member 24 secured to a power operated shaft 26 is rotated by a power source not shown to effect intermittent reciprocation of the crusher jaw member 12 hereinafter referred to as the movable crusher jaw member 12.

The movable jaw member 12 and the stationary jaw member 14 are substantially identical in construction and include plate-like body members 26 and 28 respectively, characterized by substantially planar rear surfaces 30 and generally convex working faces 32. The working faces 32 are substantially smooth and are further characterized by centrally disposed laterally extending generally con cave regions indicated generally at 34. The concave regions 34 are provided with a plurality of vertically extending spaced-apart teeth 36 having their crowns coextensive with the generaly convex surfaces 32 of the crusher jaw members 12 and 14. The roots 38 of the teeth 36, which roots coincide with the lowermost portion of the concave recess 34, at their deepest point are approximately one-half as deep as the distance between the crowns of two adjacent teeth 36.

Although FIGURES 3 through 6 generally pertain to both the movable crusher jaw 12 and the stationary crusher jaw 14 it will be understood that the teeth 36 of the respective jaw members 12 and 14 may be varied slightly in their lateral displacement so as to intermesh somewhat when the crusher jaw members 12 and 14 are in crushing engagement.

Referring to FIGURE 1 it will be seen that the surfaces 35 of the concave recess 34 are angularly related planes defined by the rear surfaces 30 of the crusher jaw members in such a manner so as to urge material to be crushed such as a rock 40 downwardly between the jaw members 12 and 14 as the movable jaw member 12 moves toward the stationary jaw member 14 thereby substantially precluding the possibility of the rock 40 being belched upwardly out from between the jaw members 12 and 14-by virtue of the nipping or pinching effect normally inherent to this apparatus of the class described were it not for the concave region 34 provided by the present invention.

As seen best in FIGURE 4 the angular surfaces 35 of the concavity 34 are inclined upwardly and outwardly preferably, although not necessarily at an angle of approximately 30 relative to a plane defined by the sub- 4 stantially fiat rear surface 30 of the respective jaw member 12 or 14.

The teeth 36 extend approximately one-half of the overall length of the crusher jaw members and are centrally disposed with regard thereto, across substantially the transverse width thereof.

In addition, the generally convex surface 32 disposed outwardly of the teeth 36 is substantially smooth so as to provide a solid crushing surface which appreciably increases the life of the crusher jaw members. The outer ends of the respective jaw members 12 and 14 are beveled downwardly and outwardly such as at 42 at an angle of approximately 25 to 40 relative to a plane defined by the rear surface 30 of the respective jaw member 12 or 14. As seen best in FIGURE 2 the beveled surfaces 42 assure that material discharging downwardly through the aw members, subsequent to crushing, will drop away freely from between the crusher members 12 and 14 by virtue of the inverted V-shaped discharge port created by the cooperation of the beveled surfaces 42.

Furthermore, while the angular relationship of the surfaces 42 with regard to a plane defined by the rear surface of the respective members 12 and 14 may vary between the jaw member 12 and the jaw member 14 it will be understood that the angular relationship of the two respective beveled surfaces 42 on any one jaw memher will be substantially identical relative to a plane defined by the rear surface 30 of that jaw member so as to permit end for end reversal of the jaw member should excessive wear occur adjacent the lower end of the jaw member due to the abrasive nature of the material being crushed and moving downwardly therealong in contact therewith.

Inasmuch as in a crusher of the class described the ends of the jaw members wear out at a faster rate than the center of the jaw members by utilizing jaw members constructed in accordance with this invention the usable life of the jaw members is greatly extended by reversing the jaw members end for end thus effecting a substantial economy of operation.

From the foregoing it will be appreciated that the coaction of the two opposed concave regions 34 and particularly the surfaces creates a pocket that directly opposes the nip or pinching angle existing in crusher jaws proposed heretofore and accordingly constitutes a significant improvement over somewhat analogous crusher aw members known heretofore.

It will be appreciated of course that rock crushers are constructed in various sizes and accordingly the over-all size as well as the weight of the jaws required will vary considerably from one model crusher to another model crusher, accordingly we do not Wish to be limited to any specific size or weight of jaw members as long as the over-all construction conforms to the inventive concept disclosed herein.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed as new is as follows:

1. In a crusher jaw for rock and the like, a reversible and replaceable jaw member comprising a plate-like body having a generally convex working face and a generally planar rear surface, said face being characterized by a centrally disposed longitudinally extending generally concave region, said concave region extending generally the width of said body, said concave region being provided with vertically extending spaced-apart teeth, said body being further provided with transversely extending beveled surfaces at the ends thereof and said concave region including outwardly and upwardly sloping surfaces disposed at approximately 30 relative to a plane defined by said generally planar rear surface whereby the tendency of an operatively positioned jaw member to belch out rock to be crushed is significantly reduced.

2. In a crusher jaw for rock and the like, a reversible and replaceable jaw member comprising a plate-like body having a generally convex working face and a generally planar rear surface, said face being characterized by a centrally disposed longitudinally extending generally concave region, said concave region extending generally the width of said body, said concave region being provided with vertically spaced-apart teeth, said teeth having roots and crowns, the depth of said roots of said teeth generally being one-half the dimension of the distance between the crowns of two adjacent teeth, said crowns being generally coextensive with said convex working face, said body beingprovided with transversely extending beveled surfaces adjacent the ends thereof, said transversely extending beveled surfaces being disposed downwardly and outwardly at approximately 25 to 40 relative to a plane defined by said generally planar rear surface of said body.

3. The structure of claim 1 wherein said centrally disposed concave region is approximately one-half the length of said body member.

4. The structure of claim 2 wherein said concave region longitudinally disposed includes outwardly and upwardly sloping surfaces disposed at approximately 30 relative to said plane defined by said planar rear surface of said body member.

5. In a crusher jaw for rock and the like, a reversible and replaceable jaw member comprising a plate-like body having a generally convex working face and a generally planar rear surface, said face being characterized by a centrally disposed longitudinally extending generally concave region, said concave region extending the width of said body, said concave region being provided with vertically spaced-apart teeth, said teeth having roots and crowns, said crowns being generally coextensive with said convex working face, said body being provided with transversely extending beveled surfaces adjacent the ends thereof, said transversely extending beveled surfaces being disposed downwardly and outwardly at approximately 25 to 40 relative to a plane defined by said generally planar rear surface of said body.

6. The structure of claim 5 wherein said centrally disposed concave region is approximately one-half the length of said body member.

7. The structure of claim 5 wherein said longitudinally disposed concave region includes outwardly and upwardly sloping surfaces disposed at approximately relative to a plane defined by said planar rear surface of said body member. g,

8. The structure of claim 2 wherein the face portions of the jaw member adjacent the lateral edges thereof are generally non-beveled whereby lateral thrust of material being crushed by said plate is significantly reduced.

9. The structure of claim 5 wherein the face portions of the jaw member adjacent the lateral edges thereof are generally non-beveled whereby lateral thrust of material being crushed by said plate is significantly reduced.

10. In a rock crusher apparatus a pair of reversible and replaceable jaw members each comprising a platelike body having a generally convex working face and a generally planar rear surface, said face being characterized by a centrally disposed longitudinally extending generally concave region, said concave region extending generally the width of said body, said concave region being provided with vertically spaced-apart teeth, said teeth having roots and crowns, the depth of said roots of said teeth generally being one-half the dimension of the distance 'between the crowns of two adjacent teeth, said crowns being generally coextensive with said convex working face, said body being provided with transversely extending beveled surfaces adjacent the ends thereof, said transversely extending beveled surfaces being disposed downwardly and outwardly at approximately 25 to 40 relative to a plane defined by said generally planar rear surface of said body.

References Cited UNITED STATES PATENTS 838,921 12/1906 Velten 241-217 X 2,950,871 8/1960 Smith 241-291 X 3,075,713 1/1963 Kautz 241291 JAMES M. MEISTER, Primary Examiner. 

